本题目来源于试卷: Wave Intensity and Decibel，类别为 美国物理杯赛(Physics Bowl)
[单选题]
05.23: A person hears a single-frequency sound; px45417jwyskdp-q vza.s 5jps8kbw from a sr0m)5bnn;s tstzgj/c7r c4 y5peaker that emits sound uniformly in all directions. The person records the decibel leve sb)t/jcy5 gc5; zt nr4mn7s0rl reading. Which of the following processes would increase the decibel reading the most?
A. The power output of the speaker is doubled.
B. The distance of the person to the speaker is halved.
C. The frequency of the sound is doubled.
D. The temperature of the air is doubled on the Kelvin scale.
E. The area over which the sound is transmitted is halved.
参考答案: B
本题详细解析:
暂无
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